The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X X^3  X X^3  X  0  X  0  X  X  X X^3+X^2  X  X X^2 X^2  X X^3+X^2  X  X  0  X  X  X  X  1  1  1  1  1  1  1  1  X  X  X  X  0 X^2 X^2 X^2 X^2  1  1  X  X  1  1
 0  X  0 X^3+X^2+X X^2 X^2+X X^3+X^2  X  0 X^3+X^2+X  0 X^2+X X^2  X X^3+X^2  X X^3 X^3+X^2+X X^3 X^2+X X^3 X^3+X^2+X X^3 X^2+X X^3+X^2 X^3+X X^2 X^3+X X^3+X^2 X^3+X X^2 X^3+X X^2+X  X X^2+X  X X^3+X^2+X  X X^3+X^2+X  X X^3 X^2  X  X X^3+X X^3+X  X  X  X  X  0 X^3+X^2  0 X^3 X^2  0 X^3+X^2  0 X^3+X^2 X^3 X^2  0 X^3+X^2 X^3 X^2 X^3+X^2+X X^3+X X^2+X  X X^3 X^2 X^3 X^3+X^2  0 X^2+X X^3+X  0 X^3+X^2 X^3+X^2+X X^3+X
 0  0 X^3+X^2 X^2 X^2 X^3 X^3 X^3+X^2 X^3 X^3+X^2 X^2  0 X^3+X^2 X^2  0 X^3 X^3 X^3 X^2 X^3+X^2  0  0 X^3+X^2 X^2 X^3+X^2 X^3+X^2 X^3  0 X^2 X^2  0 X^3  0 X^2 X^3 X^3+X^2 X^2  0 X^3+X^2 X^3 X^2 X^2 X^2  0  0 X^3 X^2 X^3+X^2 X^3+X^2 X^3 X^2 X^2 X^2 X^3+X^2 X^3+X^2 X^3+X^2 X^3+X^2  0  0 X^3 X^3 X^3 X^3  0  0 X^3 X^3+X^2 X^3+X^2  0 X^2 X^2 X^3+X^2 X^2 X^2  0  0 X^3 X^3 X^3 X^3

generates a code of length 80 over Z2[X]/(X^4) who´s minimum homogenous weight is 78.

Homogenous weight enumerator: w(x)=1x^0+176x^78+80x^79+72x^80+32x^81+96x^82+16x^83+16x^84+16x^86+5x^88+1x^96+1x^104

The gray image is a linear code over GF(2) with n=640, k=9 and d=312.
This code was found by Heurico 1.16 in 0.563 seconds.